Humans have been drinking milk since the domestication of mammals more than 10,000 years ago. Mark Kurlansky joins us to talk about our complicated history with milk – from the gene mutation that lead to lactose intolerance to milk-borne illnesses that were a leading cause of death in the 19^th Century. Kurlansky’s new book is called “Milk!: A 10,000-Year Food Fracas” (Bloomsbury).